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Die Umsetzung von Fernarbeitsregelungen wurde bisher überwiegend in allgemeiner Natur betrachtet. In der vorliegenden Arbeit wird mit Hilfe von Interviews mit Führungskräften, Mitarbeitern und IT-Dienstleistern die Umsetzung von Fernarbeitsregelungen in deutschen Regionalbanken betrachtet. Mit Hilfe der Grounded Theory werden dabei Herausforderungen, Lösungsansätze, Vorteile und Nachteile einer Umsetzung herausgearbeitet. Dabei zeigt sich, dass die Umsetzung zwischen den verschiedenen Banken starke Unterschiede aufweist, was den Fortschritt betrifft. Besonders die Überzeugung, dass eine Umsetzung vorteilhaft für die Bank sowie die Mitarbeiter ist, zeigt sich als Kernproblem in der eher konservativen Bankenlandschaft. Mit Hilfe der Arbeit werden Lösungsansätze gezeigt, um Herausforderungen bewältigen zu können und den Einfluss von Nachteilen zu minimieren. Dadurch dient die Arbeit dazu, Regionalbanken bei einer Umsetzung von Fernarbeitsregelungen zu unterstützen, indem sie Potenziale erkennen können und Möglichkeiten aufgezeigt bekommen, eine Umsetzung zu gewährleisten.
Increasingly, problematic smartphone use behavior (PSU) and excessive consumption are reported. In this study, an experiment was developed to investigate the influence of screen coloration using the grayscale setting on smartphone usage time in repeated measurements. We also investigated how individuals perceived suffering correlates with smartphone usage time and PSU, and whether differences exist by smartphone usage type (social, process, habitual). 240 subjects completed a questionnaire about smartphone usage time, PSU, perceived suffering, and smartphone usage types. Afterward, their smartphones were switched to grayscale setting for at least 24h, and thereafter 92 of these participants completed the second questionnaire. Analyses showed that grayscale setting decreases usage time and that there is a positive correlation between PSU, smartphone usage duration, and perceived suffering. The types of use (process and habitual) influence one’s perceived suffering. Thus, it shows that individuals are aware of their PSU and suffer from it. Using grayscale setting is effective in reducing smartphone use time.
Wie hingen Sprache und Gewalt im Nationalsozialismus zusammen? Ausgehend von der konstitutiven Sprachphilosophie des kanadischen Philosophen Charles Taylor untersucht die Dissertation die destruktive Wirkmacht der Sprache am Fall des Nationalsozialismus, der auf ungekannte Weise in die Sprache eingriff und damit Gewalt begünstigte, die bis heute ohnegleichen ist.
Artificial neural networks is a popular field of research in artificial intelli-
gence. The increasing size and complexity of huge models entail certain
problems. The lack of transparency of the inner workings of a neural net-
work makes it difficult to choose efficient architectures for different tasks.
It proves to be challenging to solve these problems, and with a lack of in-
sightful representations of neural networks, this state of affairs becomes
entrenched. With these difficulties in mind a novel 3D visualization tech-
nique is introduced. Attributes for trained neural networks are estimated
by utilizing established methods from the area of neural network optimiza-
tion. Batch normalization is used with fine-tuning and feature extraction to
estimate the importance of different parts of the neural network. A combi-
nation of the importance values with various methods like edge bundling,
ray tracing, 3D impostor and a special transparency technique results in a
3D model representing a neural network. The validity of the extracted im-
portance estimations is demonstrated and the potential of the developed
visualization is explored.
The trends of industry 4.0 and the further enhancements toward an ever changing factory lead to more mobility and flexibility on the factory floor. With that higher need of mobility and flexibility the requirements on wireless communication rise. A key requirement in that setting is the demand for wireless Ultra-Reliability and Low Latency Communication (URLLC). Example use cases therefore are cooperative Automated Guided Vehicles (AGVs) and mobile robotics in general. Working along that setting this thesis provides insights regarding the whole network stack. Thereby, the focus is always on industrial applications. Starting on the physical layer, extensive measurements from 2 GHz to 6 GHz on the factory floor are performed. The raw data is published and analyzed. Based on that data an improved Saleh-Valenzuela (SV) model is provided. As ad-hoc networks are highly depended onnode mobility, the mobility of AGVs is modeled. Additionally, Nodal Encounter Patterns (NEPs) are recorded and analyzed. A method to record NEP is illustrated. The performance by means of latency and reliability are key parameters from an application perspective. Thus, measurements of those two parameters in factory environments are performed using Wireless Local Area Network (WLAN) (IEEE 802.11n), private Long Term Evolution (pLTE) and 5G. This showed auto-correlated latency values. Hence, a method to construct confidence intervals based on auto-correlated data containing rare events is developed. Subsequently, four performance improvements for wireless networks on the factory floor are proposed. Of those optimization three cover ad-hoc networks, two deal with safety relevant communication, one orchestrates the usage of two orthogonal networks and lastly one optimizes the usage of information within cellular networks.
Finally, this thesis is concluded by an outlook toward open research questions. This includes open questions remaining in the context of industry 4.0 and further the ones around 6G. Along the research topics of 6G the two most relevant topics concern the ideas of a network of networks and overcoming best-effort IP.
Harvesting Season?
(2022)
Efforts to induce customers to buy groceries through the Internet have existed for around twenty years. Early on, the market structures of the digital grocery trade were still strongly fragmented and poorly coordinated. Due to the technological advancement in the past decade, the digital purchase of groceries has become more attractive. The adoption rate of these services varies greatly between different regions. In Germany in particular, the digital grocery trade is stagnating at a comparatively low level. In this regard, this dissertation analyzes both the retail-side market structures and the expectations and obstacles of German consumers.
The year 2020 connotes a turning point for the online grocery trade, as daily routines such as grocery shopping were subject to strict regulations imparted at a governmental level in order to reduce COVID-19 infections. At the same time, despite this opportunity, the digital grocery trade has not yet established itself nationwide in Germany. This can be attributed to a lack of investments, but also to inadequate digitization measures. A stronger synchronization between the digital and stationary offer, better integration of digital food services at a regional level as well as adapted, target group-appropriate digital solutions for the efficient breakdown of usage barriers will benefit service usage. The importance of stable food chains and distribution channels was illustrated by the COVID-19 pandemic. Further research should help to develop the digital food trade into a stable and sustainable supplementation of the stationary store.
Fungicide effects on the structure and functioning of leaf-associated aquatic fungal communities
(2022)
Aquatic hyphomycetes are a polyphyletic group of saprotrophic fungi growing abundantly on submerged leaf litter. In stream ecosystems shaped by allochthonous leaf litter inputs, they play a central functional role as decomposers and food source for other organisms. Fungicides pose a threat to aquatic hyphomycetes and their functions, since these substances are inherently toxic to fungi and contaminate surface waters around the world due to their widespread use in agricultural and urban landscapes. While fungicides’ potential to reduce fungal diversity are discerned, the extent of impacts on biodiversity-ecosystem functioning relationships (B EF) remains unclear. This is partly attributed to methodological constraints in the detection and quantification of single aquatic hyphomycete species within microbial leaf-associated communities. The primary aim of this thesis was, therefore, (1) to assess the ecotoxicological impacts of fungicides on B-EF relationships in aquatic hyphomycete communities. To facilitate this, subordinate aims were to (2) develop DNA-based biomolecular tools (i.e., qPCR assays) to detect and to quantify the biomass of different aquatic hyphomycete species in mixed cultures and (3) to investigate the mechanisms underlying B-EF relationships in the absence of chemical stressors.
In the course of this thesis, qPCR assays were developed for detection and species-specific biomass quantification of ten common aquatic hyphomycete species and successfully validated for application in eco( toxico )logical microcosm experiments. Via a systematic manipulation of fungal diversity, these assays allow the examination of B-EF relationships by assessments of deviations between observed and (monoculture-based) predicted activities in fungal mixed cultures. Taking advantage of these tools in a microcosm experiment, it was uncovered that leaf decomposition results from the additive activity of community members, even though functionally distinct species were present. Colonization dynamics are characterized by complex interactions. Colonization success of aquatic hyphomycetes is higher if co-occurring species are genetically and functionally distinct (i.e., complementary interactions). However, the co-occurrence of aquatic hyphomycete species does not necessarily result in a greater colonization success compared to monocultures, unless bacteria are present. Accordingly, the presence of other microbial groups such as bacteria may induce new fungal diversity-based feedback loops, which ultimately enable coexistence of aquatic hyphomycete species in the environment. Exposure to fungicides revealed substantial differences in sensitivities among aquatic hyphomycetes. The most productive species were able to cope with extremely high fungicide concentrations up to the mg/L-range. In assemblages containing these species, leaf decomposition was maintained under fungicide exposure. Yet, already at environmentally relevant fungicide concentrations, tolerant species displaced more sensitive ones, potentially affecting leaves’ nutritional quality for consumers. This thesis thus indicates that fungicide exposure poses a risk to stream food webs rather than the microbial leaf decomposition process per se.
Redaktionelle Korrektur betreffend die Satzung zur Festsetzung von Zulassungszahlen an der Universität Koblenz-Landau für das Studienjahr 2020/2021
Redaktionelle Korrektur betreffend die Fünfzehnte Ordnung zur Änderung der Prüfungsordnung für die Prüfung im lehramtsbezogenen Bachelorstudiengang
Berufsbildende Schulen an der Universität Koblenz-Landau, der Hochschule Koblenz und der Philosophisch-Theologischen Hochschule Vallendar
Redaktionelle Korrektur betreffend die Vierzehnte Ordnung zur Änderung der Ordnung für die Prüfung im Masterstudiengang Lehramt an berufsbildenden
Schulen an der Universität Koblenz-Landau, der Hochschule Koblenz und der Philosophisch-Theologischen Hochschule Vallendar
Redaktionelle Korrektur betreffend die Zweiundzwanzigste Ordnung zur Änderung der Prüfungsordnung für die Prüfung im Zwei-Fach-Bachelorstudiengang an der Universität Koblenz-Landau
Vierundzwanzigste Ordnung zur Änderung der Ordnung für die Prüfung im lehramtsbezogenen Zertifikatsstudiengang (Erweiterungsprüfung) an der Universität Koblenz-Landau und der Hochschule Koblenz
Ordnung zur Änderung der Beitragsordnung des Studierendenwerks Koblenz
Dreißigste Ordnung zur Änderung der Prüfungsordnung für die Prüfung im lehramtsbezogenen Bachelorstudiengang an der Universität Koblenz-Landau, Campus Koblenz
Sechsundzwanzigste Ordnung zur Änderung der Prüfungsordnung für die Prüfung in den Masterstudien-gängen für das Lehramt an Grundschulen, das Lehramt an Realschulen plus sowie das Lehramt an Gymnasien an der Universität Koblenz-Landau, Campus Koblenz
Dreiundzwanzigste Ordnung zur Änderung der Prüfungsordnung für die Prüfung im Zwei-Fach-Bachelor-studiengang an der Universität Koblenz-Landau, Campus Koblenz
Zweite Satzung zur Änderung der Satzung über die Verleihung der Bezeichnung außerplanmäßige Pro-fessorin oder außerplanmäßiger Professor der Universität Koblenz-Landau
Today’s agriculture heavily relies on pesticides to manage diverse pests and maximise crop yields. Despite elaborate regulation of pesticide use based on a complex environmental risk assessment (ERA) scheme, the widespread use of these biologically active compounds has been shown to be a threat to the environment. For surface waters, pesticide exposure has been observed to exceed safe concentration levels and negatively impact stream ecology leading to the question whether current ERA schemes ensure a sustainable use of pesticides. To answer this, the large-scale “Kleingewässer-Monitoring” (KgM) assessed the occurrence of pesticides and related effects in 124 streams throughout Germany, Central Europe, in 2018 and 2019.
Based on five scientific publications originating from the KgM, this thesis evaluated pesticide exposure in streams, ecological effects and the regulatory implications. More than 1,000 water samples were analysed for over 100 pesticide analytes to characterise occurrence patterns (publication 1). Measured concentrations and effects were used to validate the exposure and effect concentrations predicted in the ERA (publication 2). By jointly analysing real-world pesticide application data and measured pesticide mixtures in streams, the disregard of environmental pesticide mixtures in the ERA was evaluated (publication 3). The toxic potential of mixtures in stream water was additionally investigated using suspect screening for 395 chemicals and a battery of in-vitro bioassays (publication 4). Finally, the results from the KgM stream monitoring were used to assess the capability to identify pesticide risks in governmental monitoring programmes (publication 5).
The results of this thesis reveal the widespread occurrence of pesticides in non-target stream ecosystems. The water samples contained a variety of pesticides occurring in complex mixtures predominantly in short-term peaks after rainfall events (publications 1 & 4). Respective pesticide concentration maxima were linked to declines in vulnerable invertebrate species and exceeded regulatory acceptable concentrations in about 80% of agricultural streams, while these thresholds were still estimated partly insufficient to protect the invertebrate community (publication 2). The co-occurrence of pesticides in streams led to a risk underestimated in the single substance-oriented ERA by a factor of about 3.2 in realistic worst-case scenarios, which is further exacerbated by a high frequency at which non-target organism are exposed to pesticides (publication 3). Stream water samples taken after rainfall caused distinct effects in bioassays which were only explainable to a minor extent by the many analytes, indicating the relevance of unknown chemical or biological mixture components (publication 4). Finally, the regulatory monitoring of surface waters under the Water Framework Directive (WFD) was found to significantly underestimate pesticide risks, as about three quarters of critical pesticides and more than half of streams at risk were overlooked (publication 5).
Essentially, this thesis involves a new level of validation of the ERA of pesticides in aquatic ecosystems by assessing pesticide occurrence and environmental impacts at a scale so far unique. The overall results demonstrate that the current agricultural use of pesticides leads to significant impacts on stream ecology that go beyond the level tolerated under the ERA. This thesis identified the underestimation of pesticide exposure, the potential insufficiency of regulatory thresholds and the general inertia of the authorisation process as the main causes why the ERA fails to meet its objectives. To achieve a sustainable use of pesticides, the thesis proposes substantial refinements of the ERA. Adequate monitoring programmes such as the KgM, which go beyond current government monitoring efforts, will continue to be needed to keep pesticide regulators constantly informed of the validity of their prospective ERA, which will always be subject to uncertainty.
In dieser wiederkehrenden Zeitschriftenreihe wollen wir die Arbeit junger Wissenschaftlerinnen und Wissenschaftler an der Universität Koblenz kommunizieren und Studierenden Austausch- und Publikationsmöglichkeiten für den wissenschaftlichen Werdegang eröffnen.
In dieser Ausgabe:
Lukas Fock: Third-Person Effect & Conspiracy Theories - It's always the others!
Leoni Krawczyk: Das Déja-vu-Erlebnis als ein Resultat von impliziter Vertrautheit und oberflächlicher Reizverarbeitung
Frederik Alexander Wilczek: Employer Branding in der Katholischen Kirche - Eine Untersuchung der Employer Branding-Strategien kirchlicher Arbeitgeber
Alexander Bleffert: Modellierungsaufgaben als Beitrag zur Bildung für nachhaltige Entwicklung - Ein Beispiel für die Modellierungstage am Campus Koblenz
Alina Strunk, Fabian Kind,
Marina Gertner: Ist unser Wald noch zu retten? - Auswirkungen unterschiedlicher Waldbewirtschaftungsformen auf die natürliche Sukzession und die Bodenfeuchte - am Beispiel dreier Testflächen im Forstrevier Oberheimbach
Nils Lenard Grosch: Parameterstudie zur Synthese von Aluminium-Nonametaphosphaten
Stefanie Kröber: Sexuelle Gewalt gegen Kinder - Diskurs und Analyse therapeutischer Angebote für potenzielle Täter*innen
In the last decades, it became evident that the world is facing an unprecedented, human-induced global biodiversity crisis with amphibians being one of the most threatened species groups. About 41% of the amphibian species are classified as endangered by the IUCN, but even in amphibian species that are listed as "least concern", population declines can be observed on a local level. With land-use change and agrochemicals (i.e. pesticides), two of the main drivers for this amphibian decline are directly linked to intensive agriculture, which is the dominant landscape type in large parts of Europe. Thus, understanding the situation of amphibians in the agricultural landscape is crucial for conservation measures. In the present thesis, I investigated the effects of viticulture on amphibian populations around Landau in der Pfalz (Germany) in terms of habitat use, pesticide exposure, biometric traits as well as genetic and age structure. From the perspective of amphibians, land-use change means usually the destruction of habitats in agricultural landscapes, which often leads to landscape fragmentation. Thus, I followed the question if also vineyards lead to the fragmentation of the landscape and if pesticides that are frequently used in viticulture have to be considered as a factor too, so if there is a chemical landscape fragmentation. Using telemetry, I could show that common toads (Bufo bufo) can be found directly in vineyards, but that they tend to avoid them as habitat. Analysing the genetic structure of common frogs (Rana temporaria) revealed that vineyards have to be considered as a barrier for amphibians. To identify if pesticides contribute to the resulting landscape fragmentation, I conducted an arena choice experiment in the laboratory in which I found evidence for an avoidance of pesticide-contaminated soil. Such an avoidance could be one of the underlying reasons for a potential chemical landscape fragmentation. By combining telemetry data with information about pesticide applications from local wine growers, I could show that a large part of the common toads is likely to come in contact with pesticides. Further, I demonstrated that the agricultural landscape, probably due to the application of pesticides, can have negative effects on the reproduction capacity of common toads. By studying palmate newts (Lissotriton helveticus) I found that adult newts from agricultural ponds are smaller than those from forest ponds. As I did not find differences in the age structure and growth, these differences might be carry-over effects from earlier life stages. While agricultural ponds might be suitable habitats for adult palmate newts, the potential carry-over effect indicates suboptimal conditions for larvae and/or juveniles. I conclude that the best management measure for sustaining amphibians in the agricultural landscape would be a heterogeneous cultural landscape with a mosaic of different habitat patches that work without or at least a reduced amount of pesticides. Green corridors between populations and different habitats would allow migrating individuals to avoid agricultural and thus pesticide-contaminated areas. This would reduce the pesticide exposure risk of amphibians, while preventing the fragmentation of the landscape and thus the isolation of populations.
This thesis was motivated by the need to advance the knowledge on the variability and dynamics of energy fluxes in lakes and reservoirs, as well as about the physical processes that regulate the fluxes at both the air and water side of the air-water interface.
In the first part, I re-examine how mechanical energy, resulting from its major source – the vertical wind energy flux - distributes into the various types of water motions, including turbulent flows and surface and internal waves. Although only a small fraction of the wind energy flux from the atmosphere is transferred to the water, it is crucial for physical, biogeochemical and ecological processes in lentic ecosystems. Based on extensive air- and water-side measurements collected at two small water bodies (< 10 km2), we estimated the energy fluxes and energy content in surface and in internal waves. Overall, the estimated energy fluxes and energy content agree well with results reported for larger water bodies, suggesting that the energetics driving the water motions in enclosed basins is similar, independently of the basin size. Our findings highlight the importance of the surface waves that receive the largest fraction of the wind energy flux, which strongly nonlinearly increases for wind speeds exceeding 3 m s-1. We found that the existing parameterization of the wave height as a function of wind speed and fetch length did not reproduce the measured wave amplitude in lakes. On average, the highest energy content was observed in basin-scale internal waves, together with high-frequency internal waves exhibiting seasonal variability and varies among the aquatic systems. During our analysis, we discovered the diurnal variability of the energy dissipation rates in the studied lake, suggesting biogenic turbulence generation, which appears to be a widespread phenomenon in lakes and reservoirs.
In the second part of the thesis, I addressed current knowledge gaps related to the bulk transfer coefficients (also known as the drag coefficient, the Stanton number and the Dalton number), which are of a particular importance for the bulk estimation of the surface turbulent fluxes of momentum, sensible and latent heat in the atmospheric boundary layer. Their inaccurate representation may lead to significant errors in flux estimates, affecting, for example, the weather and climate predictions or estimations of the near-surface current velocities in lake hydrodynamic models. Although the bulk transfer coefficients have been extensively studied over the past several decades (mainly in marine and large-lake environments), there has been no systematic analysis of measurements obtained at lakes of different size. A significant increase of the transfer coefficients at low wind speeds (< 3 m s-1) has been observed in several studies, but, to date, it has remained unexplained. We evaluated
the bulk transfer coefficients using flux measurements from 31 lakes and reservoirs. The estimates were generally within the range reported in previous studies for large lakes and oceans. All transfer coefficients increased substantially at low wind speeds, which was found to be associated with the presence of gusts and capillary waves (except the Dalton number). We found that the Stanton number is systematically higher than the Dalton number. This challenges the assumption made in the Bowen-ratio method, which is widely used for estimating evaporation rates from micrometeorological measurements. We found that the variability of the transfer coefficients among the lakes could be associated with lake surface area. In flux parameterizations at lake surfaces, it is recommended to consider variations in the drag coefficient and the Stanton number due to wind gustiness and capillary wave roughness while the Dalton number could be considered as constant at all wind speeds.
In the third part of the thesis, I address the key drivers of the near-surface turbulence that control the gas exchange in a large regulated river. As all inland waters, rivers are an important natural source of greenhouse gases. The effects of the widespread alteration and regulation of river flow for human demands on gas exchange is largely unknown. In particular, the near-surface turbulence in regulated rivers has been rarely measured and its drivers have not been identified. While in lakes and reservoirs, near-surface turbulence is mainly related to atmospheric forcing, in shallow rivers and streams it is generated by bottom friction of the gravity-forced flow. The studied large regulated river represents a transition between these two cases. Atmospheric forcing and gravity were the dominant drivers of the near-surface turbulence for a similar fraction of the measurement period. Based on validated scalings, we derived a simple model for estimating the relative contributions of wind and bottom friction to near-surface turbulence in lotic ecosystems with different flow depths. Large diel variability in the near-surface energy dissipation rates due to flow regulation leads to the same variability in gas exchange. This suggests that estimates of gas fluxes from rivers are biased by measurements performed predominantly during daytime.
In addition, the novelty in all the analyses described above is the use of the turbulent surface fluxes measured directly by the eddy-covariance technique – at the moment of writing, the most advanced method. Overall, this thesis is of a potential interest for a broad range of scientific disciplines, including limnology, micrometeorology and open channel hydraulics.
In der Biologie stellt das Zeichnen eine zentrale Arbeitstechnik dar. Viele Studien konnten auf einen positiven Effekt des Zeichnens für bestimmte Situationen hinweisen. Schülerinnen und Schüler müssen diese Technik jedoch zunächst erlernen. Hierbei können zahlreiche Schwierigkeiten auftreten, die die inhaltliche Auseinandersetzung gefährden. Jedoch wurden sowohl Schwierigkeiten im Umgang mit unterschiedlichen Repräsentationsformen als auch der Zeichenprozess bislang nur lückenhaft untersucht. Die Studie dieser Arbeit hat daher zum Ziel, (I) den Zeichenprozess auf der Ebene der Sichtstruktur zu beschreiben, (II) die manifesten Schwierigkeiten von Lernenden zu erfassen, auf die sie während der Konstruktion biologisch bedeutsamer Repräsentationsformen (Ablaufdiagramme, mikroskopische Zeichnungen) treffen, (III) und auf Grundlage der empirischen Befunde Schülertypen abzuleiten. Vor diesem Hintergrund waren 21 Schülerinnen und Schüler angehalten, jeweils ein Ablaufdiagramm auf Grundlage eines Texts und eine mikroskopische Zeichnung auf Grundlage eines Präparats zu konstruieren und dabei laut zu denken. Fragen zur Vorerfahrung sowie retrospektiv gestellte Fragen zum Vorgehen der Teilnehmenden umrahmten den videografisch dokumentierten Prozess. Die Ergebnisse zeigen, dass der Zeichenprozess mehr als zehn unterschiedliche Tätigkeiten umfassen kann, wobei die Kerntätigkeit des Zeichnens durchschnittlich nur rund ein Drittel des Prozesses ausmacht. Die Prozessstruktur zwischen Fällen variiert erheblich. Weiterhin konnten etwa 30 Schwierigkeiten bzw. Fehler identifiziert werden, die während der Konstruktion beider Repräsentationsformen auftreten. Diese können dabei sowohl einzelne als auch mehrere Tätigkeiten betreffen und zu Tätigkeitsabbrüchen führen. Schwierigkeiten stehen häufig in Verbindung mit Tätigkeiten, die außerhalb der Kerntätigkeit des Zeichnens liegen (z. B. Abgleich mit der Textgrundlage). Bezogen auf Ablaufdiagramme stellt das Verhältnis depiktional bzw. deskriptional dargestellter Textinformationen den Ausgangspunkt der Typisierung dar: Typ I: realistisch abbildend, II: alternierend abbildend und III: schriftorientiert abbildend. Für mikroskopische Zeichnungen war die Häufigkeit des Abgleichs mit dem Objekt grundlegend für die Typisierung: Typ I: oberflächlich abbildend, II: objektorientiert abbildend und III: undifferenziert detailliert abbildend. Die Studie liefert erstmals Kategoriensysteme, die es erlauben, die Prozessstruktur des Zeichnens sichtbar und zwischen Fällen vergleichbar zu machen sowie schwierigkeitsbezogenes Grundlagenwissen zur Konstruktion von Zeichnungen, basierend auf Texten und Beobachtungen. Die Übertragbarkeit der Befunde auf andere Repräsentationsformen ist an vielen Stellen denkbar. Die theoretisch fundierte Systematisierung von Schwierigkeiten kann von weiterführenden Untersuchungsansätze aufgegriffen werden und erlaubt die Verortung situationsangemessener Unterstützungsmaßnahmen.
Ponds in agricultural landscapes are often used by amphibians as breeding habitat. However, the characteristics of agricultural ponds and especially the surrounding area are usually said to be suboptimal for many amphibian species. Using suboptimal habitats might allow a species’ survival and reproduction, but can have negative consequences at the individual and population level. In the present study, we investigated Palmate Newt (Lissotriton helveticus) populations from an intensive wine-growing region in southern Germany and compared them with populations located in a nearby forested area in terms of biometric traits, age and genetic structure. By analyzing over 900 adult newts from 11 ponds, we could show that newts reproducing in forest ponds were larger than newts reproducing in agricultural ponds. We did not find differences in the newt age and growth rate between habitat types. Therefore, differences in the body size of newts might already existed in larvae and/or juveniles, what might be related to a lower habitat quality for larvae and/or juveniles in the agricultural landscape. Body mass, body condition and sexual dimorphic traits (length of the caudal filament and max. height of the tail) correlated with body size, but no additional effect of the habitat type was found. The analysis of microsatellites revealed a higher genetic diversity in forest ponds. However, no clear sign of inbreeding was observed in any agricultural population, suggesting some degree of gene flow between them. We conclude, that agricultural ponds can be suitable habitats for the Palmate Newt and that conservation effort should aim to preserve them. The observed effects on body size indicate the need to increase the quality of the aquatic and terrestrial habitat for early life stages of this newt species in agricultural landscapes.
In this thesis the possibilities for real-time visualization of OpenVDB
files are investigated. The basics of OpenVDB, its possibilities, as well
as NanoVDB and its GPU port, were studied. A system was developed
using PNanoVDB, the graphics API port of OpenVDB. Techniques were
explored to improve and accelerate a single ray approach of ray tracing.
To prove real-time capability, two single scattering approaches were
also implemented. One of these was selected, further investigated and
optimized to achieve interactive real-time rendering.
It is important to give artists immediate feedback on their adjustments, as
well as the possibility to change all parameters to ensure a user friendly
creation process.
In addition to the optical rendering, corresponding benchmarks were
collected to compare different improvement approaches and to prove
their relevance. Attention was paid to the rendering times and memory
consumption on the GPU to ensure optimal use. A special focus, when
rendering OpenVDB files, was put on the integrability and extensibility of
the program to allow easy integration into an existing real-time renderer
like U-Render.
This dissertation is dedicated to a new concept for capturing renunciation-oriented attitudes and beliefs — sufficiency orientation. Sufficiency originates in the interdisciplinary sustain-ability debate. In contrast to efficiency and consistency, sufficiency considers human behaviour as the cause of socio-ecological crises and strives for a reduction in consumption respecting the planetary boundaries. The present work places sufficiency in a psychological research context and explores it qualitatively and quantitatively. On the basis of five manuscripts, the overarching question pursued is to what extent sufficiency orientation contributes to socio-ecological transformation. Based on one qualitative study and five further quantitative studies, sufficiency orientation is investigated in different behavioural contexts that are of particular importance with regard to CO2 emissions. In addition, sufficiency orientation is linked to a wider range of psychologically relevant theories that help gain an overview of correlates and possible causes for the development of a sufficiency orientation.
Manuscript 1 uses expert interviews (N = 21) to develop a heuristic framework on a transformation towards societal sufficiency orientation including barriers and enablers, as well as ambiguities on such a change. The derived elements are interpreted in the light of the leverage points approach. This framework can serve as a heuristic for future research and to develop measures concerning sufficiency orientation.
As part of an online study (N = 648), Manuscript 2 examines the extent to which sufficiency orientation can be embedded in classic models for explaining pro-environmental intentions and behaviour (Theory of Planned Behaviour, Norm Activation Model), and showed a significant contribution to the explanation of intentions and behaviour in the field of plastic consumption.
Manuscript 3 reports two framing experiments (Study 1, N = 123, Study 2, N = 330) to investigate how pro-social justice sensitivity contributes to making sufficiency orientation more salient and promoting it. While sufficiency orientation and pro-social facets of justice sensitivity were positively related to each other, there was no effect of the framing intervention in the hypothesised direction. The results indicate that justice-related information at least in the presented manner is more likely to generate reactance.
Manuscript 4 presents an online study (N = 317) and targets the importance of sufficiency orientation for predicting actual greenhouse gas emissions in relation to flight behav-iour and policy support for the decarbonisation of mobility. In addition, the connection between sufficiency orientation and global identity is examined. It turns out that sufficiency orientation is superior to global identity in predicting actual emissions and decarbonisation policies. Contrary to expectations, sufficiency orientation and the form of global identity operationalised in the presented study shows a positive correlation and are compatible.
Manuscript 5 reports a reflective diary intervention (N = 252) that should lead to a short- and long-term increase in sufficiency orientation by satisfying basic psychological needs through induced self-reflection. For both groups with or without the intervention, sufficiency orientation increased slightly but significantly. Although no specific effect of the manipulation was found, basic psychological need satisfaction turns out to be the largest predictor for sufficiency orientation. Subjective well-being is positively associated with sufficiency orientation, while time affluence shows no clear associations in the study.
Overall, the results highlight the relevance of sufficiency orientation in relation to socio-ecological transformation and actual behavioural change. Sufficiency orientation is related to low-emission behaviour and support for political measures to decarbonize infrastructures. These results contribute to the discussion on the intention-behaviour gap in regard to impact-relevant behaviour, i.e. behaviour producing high emissions. The present findings suggest, that sufficiency orientation could be related to a strong intention-behavioural consistency. However, further research is needed to validate these results and improve the measurement of sufficiency orientation. Furthermore, the studies provided insights on correlates of sufficiency orientation: justice sensitivity, global identity, subjective well-being and left-wing liberal political ideologies are all found to be positively related to sufficiency orien-tation. Moreover, basic psychological need satisfaction was identified as a potential mechanism that can support the emergence of sufficiency orientation, however, causality remains unclear. From these findings, the work derives practical implications how to possibly strengthen sufficiency orientation on the micro, meso and macro levels of society.
Taken together, the dissertation provides important insights into a new and still developing concept, and shows its connectivity to psychological theories. However, future research is required in order to grasp more precisely the complexity of sufficiency orientation and to understand origins and predictors of sufficiency orientation. This work contributes to the interdisciplinary debate on socio-ecological transformation and points out that sufficiency orientation can serve to a future worth living as being related to reduced consumption.
Social networks are ubiquitous structures that we generate and enrich every-day while connecting with people through social media platforms, emails, and any other type of interaction. While these structures are intangible to us, they carry important information. For instance, the political leaning of our friends can be a proxy to identify our own political preferences. Similarly, the credit score of our friends can be decisive in the approval or rejection of our own loans. This explanatory power is being leveraged in public policy, business decision-making and scientific research because it helps machine learning techniques to make accurate predictions. However, these generalizations often benefit the majority of people who shape the general structure of the network, and put in disadvantage under-represented groups by limiting their resources and opportunities. Therefore it is crucial to first understand how social networks form to then verify to what extent their mechanisms of edge formation contribute to reinforce social inequalities in machine learning algorithms.
To this end, in the first part of this thesis, I propose HopRank and Janus two methods to characterize the mechanisms of edge formation in real-world undirected social networks. HopRank is a model of information foraging on networks. Its key component is a biased random walker based on transition probabilities between k-hop neighborhoods. Janus is a Bayesian framework that allows to identify and rank plausible hypotheses of edge formation in cases where nodes possess additional information. In the second part of this thesis, I investigate the implications of these mechanisms - that explain edge formation in social networks - on machine learning. Specifically, I study the influence of homophily, preferential attachment, edge density, fraction of inorities, and the directionality of links on both performance and bias of collective classification, and on the visibility of minorities in top-k ranks. My findings demonstrate a strong correlation between network structure and machine learning outcomes. This suggests that systematic discrimination against certain people can be: (i) anticipated by the type of network, and (ii) mitigated by connecting strategically in the network.
This study examines the contribution of saving and credit cooperatives (SACCOS) on the improvement of members‘ socio economic development in Rwanda: Opportunities and challenges‖, Evidence from Umwalimu SACCO- Huye District‖. The appearance of saving and credit cooperatives or credit unions has been known as remedy for social ills rooted in poverty because of its efficiency in loans or credits dispensation, social equality for enhancement and reduction of poverty amongst low income earners. Therefore, millions and millions of poor people and non-bankable in developing countries (or third world countries) have been provided access to formal financial services through saving and credit cooperatives‘ programs.
The targeted population concerned by the study was 1,940 members of USACCO from which a sample of 92 respondents was purposively selected. The study has adopted a combination of correlation and descriptive research design. It has employed both quantitative and qualitative approaches. The study used both primary and secondary data. The primary data was collected using questionnaire and interview and, while secondary data was collected using documentations techniques whereby, Manual of procedures and Credit policies of USACCO and financial reports have been consulted. The analysis of data was done using SPSS version 21. The data was presented in form of tables, charts and graphs designed by SPSS v. 21. The bio-characteristics of respondents showed that, the majority of respondents were women with 55.4%, majority of respondents‘ age is between 26 to 45 years Furthermore, and majority 77.20% of respondents were married. 100% of respondents attended school, where the majority of respondents attended secondary school with certificate A2.
The study has revealed that Umwalimu SACCO services offered to its members have a positive effect on the improvement of members‘ welfare. It was found that USACCO services have slightly affected income level of members, assets acquired, access to education and medical care as well as small income generating activities established by members in Huye District. The analysis of data also revealed that there are some variables which have effected USACCO members‘ socio-economic status, these were listed as: Education background of a member, number of dependents, the occupation of a member, and number of loans got from USACCO, government programs against teachers‘ welfare, and membership duration played very important role on the improvement of standard living of teachers. All these variables were found to have positive effects on teachers‘ socio-economic status, except the family size of respondents.
In addition, the findings showed that, the majority of respondents confirmed that, they did not find opportunities to save with other financial institutions, and other respondents did not have access to loan from other financial institutions due to complicated loan requirements. In addition, after they
have joined USACCO, their deplorable status somewhat changed, both socially and economically which has contributed to the improvement of their welfare. Therefore, the study testified that, the welfare of USACCO members in terms of assets acquired, income increased was improved compared to situation before joining USACCO. The study concludes that ―the level of improvement of living conditions of teachers depends largely to the level of loan granted by USACCO to teachers and membership duration. If the level of teachers‘ loan and saving increases, there will be also improvement of teachers‘ wellbeing‖ and finally, USACCO financial service is a veritable instrument for better improvement of economic and social conditions of teachers. The study recommends that, USACCO should provide frequent and regular trainings on business management game to their members. This could help members for good management of their loans and reducing loan defaulters‘ cases observed at USACCO. Challenges observed were lack of physical collateral security required by USACCO, complicated loan requirements terms and conditions and insufficient trainings on business management game.
Instructor feedback on written assignments is one of the most important elements in the writing process, especially for students writing in English as a foreign language. However, students are often critical of both the amount and quality of the feedback they receive. In order to better understand what makes feedback effective, this study explored the nature of students’ assessments of the educational alliance, and how their receptivity to, perceptions of, and decisions about using their instructors’ feedback differed depending on how strong they believed the educational alliance to be. This exploratory case study found that students not only assessed the quality of the educational alliance based on goal compatibility, task relevance, and teacher effectiveness, but that there was also a reciprocal relationship between these elements. Furthermore, students’ perceptions of the educational alliance directly influenced how they perceived the feedback, which made the instructor’s choice of feedback method largely irrelevant. Stronger educational alliances resulted in higher instances of critical engagement, intrinsic motivation, and feelings of self-efficacy. The multidirectional influence of goal, task, and bond mean that instructors who want to maximize their feedback efforts need to attend to all three.
The growing numbers of breeding rooks (Corvus frugilegus) in the city of Landau (Rhineland- Palatinate, Germany) increase the potential for conflict between rooks and humans, which is mainly associated with noise and faeces. Therefore, the aim of this work is a better understanding of the breeding tree selection of the rook in order to develop options for action and management in the future.
Part I of this thesis provides general background information on the rook and includes mapping of the rookeries in the Anterior Palatinate and South Palatinate including Landau in the year 2020. That mapping revealed that the number of rural colonies has decreased, while the number of urban colonies has increased in the study area in the last few years. In line with current literature, tree species and tree size were important criteria for breeding tree selection. However, the mapping showed that additional factors must be important as well.
Therefore, as rooks seem to often breed along traffic axes, Part II of this thesis examines how temperature, artificial light and noise, which are all linked to traffic axes, affect the breeding tree selection of the rook in the city of Landau. The following three hypotheses are developed: (1) manually selected breeding trees (Bm) have a warmer microclimate than manually selected non-breeding trees (Nm) or randomly selected non-breeding trees (Nr), (2) Bm are exposed to a higher light level than Nm or Nr and (3) Bm are exposed to a higher noise level than Nm or Nr. To test these hypotheses, 15 Bm, 13 Nm and 16 Nr are investigated.
The results show that Bm were exposed to more noise than both types of non-breeding trees (μBm, noise = 36.52481 dB, μNm, noise = 31.27229 dB, μNr, noise = 29.17417 dB) where the difference between Bm and Nr was significant. In addition, there was a tendency for Bm to be exposed to less light (μBm, light = 0.356 lx) than Nm (μNm, light = 0.4107692 lx) and significantly less light than Nr (μNr, light = 1.995 lx), while temperature did not differ between the groups (μBm, temp = 16.90549 °C, μNm, temp = 16.93118 °C, μNr, temp = 17.28639 °C).
This study shows for the first time that rooks prefer trees which are exposed to low light levels and high noise levels, i.e. more intense traffic noise, for breeding. It can only be speculated that the cause of this is lower enemy pressure at such sites. The fact that temperature does not seem to have any influence on breeding tree selection may be due to only small temperature differences at nest height, which might be compensated by breeding behaviour. Consequently, in the long term one management approach could be to divert traffic from inner-city areas, especially schools and hospitals, to bypasses. If tree genera suitable for rooks, such as plane trees, are planted along the bypasses, those sites could provide suitable alternative habitats to inner-city breeding locations, which become less attractive for breeding due to noise reduction. In the short term in addition to locally implemented repellent measures the most effective approach is to strengthen rook acceptance among the population. However, further research is needed to verify the results of this thesis and to gain further insights into rook breeding site selection in order to develop effective management measures.
Abstract zum Print-Buch: Walden, R. (2008). Architekturpsychologie: Schule, Hochschule und Bürogebäude der Zukunft. Lengerich: Pabst Science Publishers. Menschen wünschen sich im Allgemeinen „Kontrolle“ über ihre Umweltbedingungen (vgl. Flammer, 1990; Burger, 1992). Dieses Bedürfnis kommt in Form von Selbstgestaltungen von Architektur und Selbstregulierungen von Stressoren zum Ausdruck. Aus diesem Grund wird das Konzept der Umweltkontrolle als zentrales Kriterium für gebaute Umwelten in allen drei Fall-Studien zu Schule, Hochschule und Büro angewendet. Die Erhebung smethoden Programming (nutzerorientierte Programmentwicklung), User-Needs Analysis (Nutzer-Bedarfs-Analyse) und Post-Occupancy Evaluation werden im Hinblick auf ihren Stellenwert für die Building Performance Evaluation (Gebäudeleistungsevaluation) (Preiser & Schramm, 1997; 2005) erläutert. Der „Koblenzer Architekturfragebogen“ wird als Instrument zur Beurteilung von gebauten Umwelten in drei Varianten vorgestellt. Es werden zu den drei Studien jeweils ausgewählte Ergebnisse zu zwei verschiedenen Umweltbereichen berichtet.
Auswirkungen von Architektur auf Performance von Nutzern (vgl. BOSTI-Studien, 1984, 2001) werden im empirischen Teil in drei Studien zu innovativen Gebäuden (Waldorfschule in Köln, Universität in Koblenz, Post Tower in Bonn) ermittelt. Performance wird gemessen anhand von 1) Lern- und Arbeitsleistungen, 2) Wohlbefinden und 3) Umweltkontrolle sowie 4) Sozialverhalten im Fall der Schulstudie und mit der Hilfe von 16 (Bürogebäude) bzw. 21 (Universität) psychologischen Kriterien für den Erfolg von Organisationen. Ziel aller drei Studien ist unter anderem, das theoretische Konzept „Umweltkontrolle“ zu überprüfen und Empfehlungen für Verbesserungen von Um- bzw. Neubauten benennen zu können. Zwei zentrale Frages tellungen lauten daher: Unterscheidet sich in einer User-Needs Analysis eine Einschätzung des Gebäudes „zur Zeit“ von der Beurteilung der „Wichtigkeit in Zukunft“? Haben Merkmale der Architektur Auswirkungen auf die Performance-Kriterien?
Zu den Studien wurden drei Abbildungssätze nach dem Facettenansatz (Borg, 1996) und zwei Schemata zur Beurteilung der Qualität von Schul- und Bürogebäuden entwickelt. Aus den Schemata wurden zur Schule 139 Fragen für 26 Lehrer und 86 Fragen für 122 Schüler gewonnen, zur Hochschule 203 Fragen für 147 Studierende und 28 Dozenten sowie zu dem Bürogebäude 254 Fragen für 56 studentische Beurteiler. Einzelne Merkmale von Gebäuden wurden anhand einer Skala von +2 ☺☺ („zur Zeit“ sehr gut bzw. sehr wichtig „in Zukunft“) bis –2 // („zur Zeit“ sehr schlecht bzw. sehr unwichtig „in Zukunft“) bewertet. Die drei Performance-Hauptkriterien, insbesondere zu der Einschätzung der „Wichtigkeit in Zukunft“, korrelieren in der Regel in allen drei Studien substanziell und hoch signifikant miteinander, so dass erwartet werden kann, dass eine höhere Ei nschätzung von Umweltkontrolle durch die Nutzer
zu mehr Wohlbefinden führt und über beide Va riablen auch die Beurteilungen von Lern- und Arbeitsleistungen „in Zukunft“ gesteigert werden können. Nach den Ergebnissen der drei Studien wünschen si ch die Nutzer bzw. Beurteiler beispielsweise in allen drei Umwelten Rückzugsmöglichkeiten, in der Schule in Form von Schülerbüros, Nischen und Sitzgruppen im Klassenzimmer, in der Universität in Form von geschützten Bänken im Außenbereich und Arbeitstischen zum Beispiel in der Cafeteria und im Bürogebäude durch weniger Transparenz im Kombibüro und damit weniger Einsicht aller Tätigkeiten durch Vorgesetzte und Kollegen. Die in den drei Studien ermittelten Zusammenhänge der zentralen Perfor mance-Kriterien lassen begründet annehmen, dass durch gezielte Verbesserungen wichtiger Umweltaspekte, insbesondere solcher, die Umweltkontrolle ermöglichen, das Wohlbefinden und somit die Leistung von Nutzern positiv beeinflusst werden kann.
Resumen del libro impreso : Walden, R. (2008). Psicología arquitectónica: Escuela, escuela superior y edificios de oficinas del futuro. Lengerich: Pabst Science Publishers. Las personas desean, por lo general, un “contr ol“ sobre las condiciones de su entorno (comp. Flammer, 1990; Burger, 1992). Esta necesidad queda de manifiesto en forma de autoorganizaciones de la arquitectura y la autorregulación de los factores de estrés. Por esta razón, el concepto de control del medio ambiente se aplica como criterio central para los entornos construidos en los tres estudios de caso: de la escuela, de la universidad y de la s oficinas. Los métodos de encuesta "Programming" (desarrollo del programa orientado al usuario), "U ser-Needs Analysis" (análisis de necesidades del usuario) y "Post-Occupancy Evaluation" (análisis post-ocupacional) se explican con vistas a su importancia para la "Building Performance Evaluation" (evaluación del rendimiento del edificio) (Preiser & Araña, 1997; 2005). La “evaluación arquitectónica de Koblenz“ se presenta como instrumento para evaluar los entornos construidos en tres variantes. Los resultados elegidos de dichos tres estudios se relacionan, a su vez, con dos entornos diferentes. Los efectos de la arquitectura sobre el rendimiento de los usuarios (comp. Estudios BOSTI, 1984 y 2001) se establecen en la parte empírica en tres estudios de edificios innovadores (Escuela Waldorf en Köln, Universidad de Koblenz, Post Tower en Bonn). La eficacia se mide a través de: 1) el rendimiento de aprendizaje y laboral, 2) el bienestar y 3) el control del medio ambiente, así como 4) el comportamiento social en el caso del estudio escola r y con la ayuda de 16 (edificios de oficina) y 21 (universidades) criterios psicológicos para el éxito de las organizaciones. La meta de los tres estudios es, entre otras cosas, revisar el concepto teórico de "control del medio ambiente" y poder dar nuevas recomendaciones para mejorar en las reformas y ta mbién en las nuevas construcciones. Por eso, dos planteamientos centrales son: en el análisis de necesidades del usuario, la opinión del edificio "en la actualidad", ¿se diferencia de la evaluación de la “importancia en el futuro”?; las características de la arquitectura ¿tienen repercusión en los criterios de rendimiento?. Con los estudios se desarrollaron tres teoremas según el enfoque de facetas (Borg, 1996) y dos esquemas para la evaluación de calidad de los edificios escolares y de oficinas. De los esquemas se obtuvieron: para la escuela, 139 preguntas para 26 profesores y 86 preguntas para 122 alumnos; para la escuela superior, 203 preguntas para 147 estudian tes y 28 docentes, así como para el edificio de oficinas 254 preguntas para 56 censores estudiantiles. Las características particulares de los edificios se calificaron mediante una escala de +2 ☺☺ ("en la actualidad" muy buenas y “en el futuro” muy importantes respectivamente) a –2 // ("en la actualidad" muy malas y “en el futuro“ muy insignificantes respectivamente). Los tres criterios principales de rendimiento, especialmente para la evaluación de la “importancia en el futuro“, están correlacionados uno con el otro en los tres estudios, por lo general, de manera sustancial y muy significativa, de manera que se puede esperar que una evaluación superior del control del medio ambiente llevada a cabo por los usuarios conduzca a más bienestar y que, sobre ambas variables, también puedan ser aumentadas las evaluaciones de rendimientos de aprendizaje y laboral “en el futuro“. Según los resultados de los tres estudios, los usuarios y los censores desean por ejemplo, en los tres entornos, la posibilidad de retiro: en la escuela, en forma de oficinas de alumnos, nichos y tresillos en el aula; en la universidad, en forma de bancos protegidos en el área exterior y mesas de trabajo, por ejemplo, en la cafetería; y en el edificio de ofic inas a través de menos transparencia en las oficinas compartidas y con eso menos visión de todas las actividades entre jefes y compañeros. Las relaciones de los criterios de rendimiento centrales establecidas en los tres estudios dejan suponer de modo justificado que, mediante mejoras concretas de aspectos importantes del entorno -sobre todo de aquellos que permiten el control del mismo-, se puede influir de manera positiva sobre el bienestar y, con esto, sobre el rendimiento de los usuarios. Palabras claves: necesidades del usuario, análisis; evaluación del rendimiento del edificio; control del medio ambiente (autoorganización, regulación de los factores de estrés, control social), bienestar, rendimientos de aprendizaje y laboral, comportamiento social; criterios del éxito de las Resumen 5 organizaciones; teoría de las facetas; esquema para la evaluación de la calidad de los edificios; recomendaciones para la construcción de edificios con visión de futuro.
The presented study was motivated by the dynamic phenomena observed in basic catalytic surface reactions, especially by bi- and tristability, and the interactions between these stable states. In this regard, three reaction-diffusion models were developed and examined using bifurcation theory and numerical simulations.
A first model was designed to extend the bistable CO oxidation on Ir(111) to include hydrogen and its oxidation. The differential equation system was analyzed within the framework of bifurcation theory, revealing three branches of stable solutions.
One state is characterized by high formation rates (upper rate state, UR), while the other two branches display low formation rates (lower rate (LR) \& very low rate (VLR) states).
The overlapping branches form the shape of a `swallowtail', the curve of saddle-node bifurcations forming two cusps. Increasing the temperature leads to a subsequent unfolding and hence decreases the system complexity.
A series of numerical simulations representing possible experiments was conducted to illustrate the experimental accessibility (or the lack) of said states. Relaxation experiments show partially long decay times. Quasistatic scanning illustrates the existence of all three states within the tristable regime and their respective conversion once crossing a fold.
A first attempt regarding the state dominance in reaction-diffusion fronts was done. While UR seems to dominate in 1D, a 2D time-evolution shows that LR invades the interphase between UR and VLR.
Subsequently, a generic monospecies mock model was used for the comprehensive study of reaction-diffusion fronts. A quintic polynomial as reaction term was chosen, derived by the sixth-order potential associated with the `butterfly bifurcation'. This ensures up to three stable solutions($u_{0}$,$u_{1}$,$u_{2}$), depending on the four-dimensional parameter space.
The model was explored extensively, identifying regions with similar behaviors.
A term for the front velocity connecting two stable states was derived, depending only on the relative difference of the states' potential wells.
Equipotential curves were found, where the front velocity vanishes of a given front. Numerical simulations on a two-dimensional, finite disk using a triangulated mesh supported these findings.
Additionally, the front-splitting instability was observed for certain parameters. The front solution $u_{02}$ becomes unstable and divides into $u_{01}$ and $u_{12}$, exhibiting different front velocities. A good estimate for the limit of the front splitting region was given and tested using time evolutions.
Finally, the established mock model was modified from continuous to discrete space, utilizing a simple domain in 1D and three different lattices in 2D (square, hexagonal, triangular).
For low diffusivities or large distances between coupling nodes, fronts can become pinned, if the parameters are within range of the equipotential lines. This phenomenon is known as propagation failure and its extent in parameter space was explored in 1D. In 2D, an estimate was given for remarkable front orientations respective to the lattice using a pseudo-2D approximation. Near the pinning region, front velocities differ significantly from the continuous expectation as the shape of the curve potential becomes significant. Factors that decide the size and shape of the pinning regions are the coupling strength, the lattice, the front orientation relative to the lattice, and the front itself. The bifurcation diagram shows a snaking curve in the pinning region, each alternating branch representing a stable or unstable frozen front solution. Numerical simulations supported the observations concerning propagation failure and lattice dependence.
Furthermore, the influence of front orientation on the front velocity was explored in greater detail, showing that fronts with certain lattice-dependent orientations are more or less prone to propagation failure. This leads to the possibility of pattern formation, reflecting the lattice geometry. An attempt to quantify the front movement depending on angular front orientation has shown reasonable results and good agreement with the pseudo-2D approach.
Beim Zugang zur dualen Berufsausbildung haben Jugendliche und junge Erwachsene mit Migrationshintergrund schlechtere Chancen in eine betriebliche Berufsausbildung einzumünden. Vermehrt wird ein Forschungsbedarf thematisiert, der den Blick darauf richtet, wie die entsprechenden Auswahlentscheidungen in den Betrieben getroffen werden. Die Dissertation setzt an dieser Frage an und befasst sich mittels eines biographischen Zugangs mit den Personalentscheiderinnen und Personalentscheidern, den sogenannten Gatekeepern, in den Betrieben. Im Erkenntnisinteresse steht die Frage, ob und wie biographische Erfahrungen Bedeutung für Auswahlentscheidungen zugunsten zugewanderter junger Menschen haben.
Abstract for the print-book: Walden, R. (2008). Architectural Psychology: School, University Campus, and Office Building of the Future. Lengerich: Pabst Science Publishers (in German). The need for display of self in architecture and for users' self-regulation of stress factors, which demonstrate that users crave individual control of their environment (cf. Flammer, 1990; Burger, 1992) motivated this study to use the concept of environmental control as a central criterion for the evaluation of built environment. It was applied to three case studies: a school, a university campus, and an office building. Advantages and disadvantages of the data- gathering methods of architectural Programming, User-Needs Analysis, and Post-Occupancy Evaluation were analyzed to highlight their significance in terms of Building Performance Evaluation as described by Preiser and Sc hramm (1997, 2005). The “Koblenz Architecture Questionnaire” was used as an instrument for assessing the built environment of the three case studies, and the study reports selected findings from these questionnaires. The investigation seeks to determine the effect of architecture - especially buildings' provisions for user control of environmental conditions - on user performance (cf. BOSTI studies, 1984, 2001) in three innovative buildings: the Waldorf School in Cologne, the new campus for the University in Koblenz, and the Office Tower of the Deutsche Post World Net AG in Bonn. Performance is measured in terms of (1) Lear ning and Work Efficiency, (2) Well-being, (3) Environmental Control, (4) Social Behavior (the latter just for the school project), and by means of 21 and 16 additional psychological criteria for success of the organization in the cases of the university and the office building, respectively. The study aims, among other things, at reassessing the theoretical concept of 'environmental control' and at making recommendations for both improvement of existing buildings and the design of new projects. Two central questions are: In User-Needs Analysis, what is the difference between the assessment of a building for its current use and its estimated performance in future? Do certain architectural features influence user assessments on the given performance criteria? In the studies, three mapping sentences were developed according to the 'facet approach' (Borg, 1996) as well as two systems to judge the quality of school and office buildings. Using these systems, information was obtained in all three studies to construct questionnaires. In the school study, teachers were asked 139 questions, pupils 86 questions. Responses were obtained from 26 teachers and 122 pupils. For the university, 147 students and 28 faculty members responded to 203 questions. For the office building, 56 student-experts were asked 254 questions. Characteristics of the built environment were rated using the following scale: +2 ☺☺ (very good “at present”, and accordingly very important “in the future”) down to –2 // (very bad “at present”, and very unimportant “in the future”). A general finding was a high and significant co rrelation between the responses for the three main performance criteria in all three case studies, especially for the 'importance for the future' aspect. This supports the conclusion that a perception of higher degree of environmental control by users will lead to an increased sense of well-being and consequently, there will also be a higher expectation of improved work or learning efficiency 'in the future'. The three studies further show for example that users in all three environments desire 'retreat opportunities' which may take the form of student offices in schools, niches and small group seating in classrooms, and sheltered seating in outdoor areas and work tables in the cafeteria for the university. For the offices, users wanted more visual privacy (less transparent office partitions in Combi Offices) for less visual control of their activities by supervisors and co-workers. The relationships found by the studies between the responses on the central performance criteria and the spatial characteristics of the three buildings support the contention that focused improvements in the built environment, especially with respect to features that enhance user control of environmental conditions, will influence users’ well-being as well as work performance and work or learning efficiency in a positive way.
Fünfundzwanzigste Ordnung zur Änderung der Ordnung für die Prüfung im lehramtsbezogenen Zertifikatsstudiengang (Erweiterungsprüfung) an der Universität Koblenz-Landau und der Hochschule Koblenz
Satzung über die Leitung und die innere Struktur wissenschaftlicher Einrichtungen und Betriebseinheiten der Universität Koblenz
Satzung zur Festsetzung der Normwerte für den Ausbildungsaufwand (Curricularnormwerte) der Universität Koblenz-Landau – Campus Koblenz
Satzung zur Festsetzung von Zulassungszahlen an der Universität Koblenz-Landau – Campus Koblenz für das Studienjahr 2022/2023
Satzung zur Festsetzung der Normwerte für den Ausbildungsaufwand (Curricularnormwerte) der Universität Koblenz-Landau – Campus Landau
Satzung zur Festsetzung von Zulassungszahlen an der Universität Koblenz-Landau – Campus Landau für das Studienjahr 2022/2023
Wahlordnung für die Wahlen der Organe der Rheinland-Pfälzischen Technischen Universität Kaiserslautern-Landau
Grundordnung der Rheinland-Pfälzischen Technischen Universität Kaiserslautern-Landau
Zehnte Ordnung zur Änderung der Ordnung für die Prüfung im Bachelorstudiengang Umweltwissenschaften und in den Masterstudiengängen Umweltwissenschaften / Environmental Sciences und Ecotoxicology (Environmental Pollution Management) an der Universität Koblenz-Landau, Campus Landau
Agricultural plastic covers made from polyethylene (PE) and polypropylene (PP) provide increased yields and an improved crop quality. However, such covers are suspected of partially breaking down into smaller debris and thereby contributing to soil pollution with microplastics. To scrutinize this, we randomly sampled 240 topsoil cores (0–5 cm) from eight fields which were covered with fleeces, perforated foils, and plastic mulches for less than 2 years. Samples from the field periphery (50 m perimeter) served as a reference. Visual plastic debris > 2 mm was analyzed by Fourier transform infrared spectroscopy. Smaller, soil-associated plastic debris was dispersed from 50 g of fine soil (≤ 2 mm) using sodium hexametaphosphate solution and density-separated with saturated NaCl solution. The collected PE, PP, and polystyrene (PS) debris was selectively dissolved in a mixture of 1,2,4-trichlorobenzene and p-xylene at 150 °C and quantified by pyrolysis–gas chromatography–mass spectrometry (Py-GC/MS). We counted six PE and PS fragments > 2 mm in two out of eight fields. By contrast, Py-GC/MS detected PE, PP, and PS contents in the fine soil of six fields (6 % of all samples). In three fields, PE levels of 3–35 mg kg−1 were potentially associated with the use of thinner and less durable perforated foils (40 µm thickness). This was slightly more pronounced at field edges where the plastic covers are turned and weighed down. By contrast, 50 µm thick PE films were not shown to emit any plastic debris. PP contents of 5–10 mg kg−1 were restricted to single observations in the field centers of three sites. At one site, we found expanded PS particles > 2 mm that concurred with elevated PS levels (8–19 mg kg−1) in the fine soil. Both PP and PS were distributed indistinctly across sites so that their source remained unresolved. In addition, the extent to which plastic contents of up to 7 mg kg−1 in the field periphery of some sites were attributed to wind drift from the covered fields or from external sources needs to be investigated in future studies. Our results suggest that the short-term use of thicker and more durable plastic covers should be preferred over thinner or perforated films to limit plastic emissions and accumulation in soil.
This thesis explores a 3D object detection and pose estimation approach based on the point pair features method presented by Drost et. al. [Dro+10]. While pose estimation methods have shown good improvements, they still remain a crucial problem on the computer vision field. In this work, we implemented a program that takes point cloud scenes as input and returns the detected object with their estimated pose. The program fully covers an object detection pipeline by processing 3D models during an offline phase, extracting their point pair features and creating a global descriptor out of them. During an online phase, the same features are extracted from a point cloud scene and are matched to the model features. After the voting scheme, potential poses of the object are retrieved. The poses end being clustered together and post-processed to finally deliver a result. The program was tested using simulated and real data. We evaluate these tests and present the final results, by discussing the achieved accuracy of the detections and the estimated poses.
These proceedings contain 6 papers presented at the 1st Interdisciplinary Conference on Gamification and Entrepreneurship (StartPlay) 2022. The conference was held at the University of Koblenz-Landau in Koblenz, Germany, on August 05-06, 2022.
Game-Balance Simulation as a Tool for the Evaluation of
Systematically Designed Gamification Strategies
Authors: David Kessing, Manuel Löwer
A Canvas Framework for Gameful Design Concepts
Authors: Max Höllen, Thomas Voit
Gamified Sustainable Entrepreneurship Education –
A digital Educational Escape Room for economy classes
in German High Schools
Authors: Jürgen Frentz, Marie Tuchscherer, Claudia Wiepcke
Playing Positive Psychology: The Development of a
Positive-Psychological Board Game for Team Building
Authors: Leonie Kloep, Anna-Lena Helten, Corinna Peifer
Gamification Design for Goal Activation and Goal Striving
in Digital Marketing and Innovation Management
Authors: Jenny V. Bittner, Christian Wellmann
Gamification of Assembly Routines: Planned User Study
Evaluating a Level System with Customized Feedback
Elements
Authors: Jessica Ulmer, Sebastian Braun, Jörg Wollert
This study was conducted in Nyungwe National Park (NNP); a biodiversity hotspot Mountain rainforest of high conservation importance in Central Africa, but with little knowledge of its insect communities including butterflies, good indicators of climate change, and forest ecosystem health. The study aimed at availing baseline data on butterfly species diversity and distribution in NNP, for future use in monitoring climate change-driven shifts and the effects of forest fragmentation on the biodiversity of Nyungwe. Butterflies were collected seasonally using fruit-baited traps and hand nets along elevational transects spanning from 1700 m up to 2950 m of altitude. Two hundred forty-two species including 28 endemics to the Albertine Rift and 18 potential local climate change indicators were documented. Species richness and abundance declined with increasing elevation and higher seasonal occurrence was observed during the dry season. This was the first study on the spatial and temporal distribution of butterflies in NNP and further studies could be conducted to add more species and allow a depth understanding of the ecology of Nyungwe butterflies.
Semantic Web technologies have been recognized to be key for the integration of distributed and heterogeneous data sources on the Web, as they provide means to define typed links between resources in a dynamic manner and following the principles of dataspaces. The widespread adoption of these technologies in the last years led to a large volume and variety of data sets published as machine-readable RDF data, that once linked constitute the so-called Web of Data. Given the large scale of the data, these links are typically generated by computational methods that given a set of RDF data sets, analyze their content and identify the entities and schema elements that should be connected via the links. Analogously to any other kind of data, in order to be truly useful and ready to be consumed, links need to comply with the criteria of high quality data (e.g., syntactically and semantically accurate, consistent, up-to-date). Despite the progress in the field of machine learning, human intelligence is still essential in the quest for high quality links: humans can train algorithms by labeling reference examples, validate the output of algorithms to verify their performance on a data set basis, as well as augment the resulting set of links. Humans —especially expert humans, however, have limited availability. Hence, extending data quality management processes from data owners/publishers to a broader audience can significantly improve the data quality management life cycle.
Recent advances in human computation and peer-production technologies opened new avenues for human-machine data management techniques, allowing to involve non-experts in certain tasks and providing methods for cooperative approaches. The research work presented in this thesis takes advantage of such technologies and investigates human-machine methods that aim at facilitating link quality management in the Semantic Web. Firstly, and focusing on the dimension of link accuracy, a method for crowdsourcing ontology alignment is presented. This method, also applicable to entities, is implemented as a complement to automatic ontology alignment algorithms. Secondly, novel measures for the dimension of information gain facilitated by the links are introduced. These entropy-centric measures provide data managers with information about the extent the entities in the linked data set gain information in terms of entity description, connectivity and schema heterogeneity. Thirdly, taking Wikidata —the most successful case of a linked data set curated, linked and maintained by a community of humans and bots— as a case study, we apply descriptive and predictive data mining techniques to study participation inequality and user attrition. Our findings and method can help community managers make decisions on when/how to intervene with user retention plans. Lastly, an ontology to model the history of crowd contributions across marketplaces is presented. While the field of human-machine data management poses complex social and technical challenges, the work in this thesis aims to contribute to the development of this still emerging field.
Einunddreißigste Ordnung zur Änderung der Prüfungsordnung für die Prüfung im lehramtsbezogenen
Bachelorstudiengang an der Universität Koblenz-
Landau, Campus Landau
Siebenundzwanzigste Ordnung zur Änderung der
Prüfungsordnung für die Prüfung in den Masterstudiengängen für das Lehramt an Grundschulen, das Lehramt an Realschulen plus, das Lehramt an Förderschulen sowie das Lehramt an Gymnasien an der
Universität Koblenz-Landau, Campus Landau
Sechsundzwanzigste Ordnung zur Änderung der
Ordnung für die Prüfung im lehramtsbezogenen
Zertifikatsstudiengang (Erweiterungsprüfung) an der
Universität Koblenz-Landau, Campus Landau
Zweite Ordnung zur Änderung der Prüfungsordnung
für den Bachelorstudiengang „Mensch und Umwelt:
Psychologie, Kommunikation, Ökonomie“ an der Universität Koblenz-Landau, Campus Landau
Achte Ordnung zur Änderung der Prüfungsordnung
für den Bachelorstudiengang und den Masterstudiengang
„Sozial- und Kommunikationswissenschaften“
des Fachbereichs 6: Kultur- und Sozialwissenschaften
an der Universität Koblenz-Landau
Vierundzwanzigste Ordnung zur Änderung der Prüfungsordnung für die Prüfung im Zwei-Fach-Bachelorstudiengang an der Universität Koblenz-Landau,
Campus Landau
Zweite Ordnung zur Änderung der Prüfungsordnung
für die Bachelor- und Masterstudiengänge des Fachbereichs Informatik an der Universität Koblenz-
Landau
This thesis deals with the question of which success factors apply to social media marketing. German start-up companies are examined for this purpose. The investigation is based on ten semi-structured expert interviews, which are evaluated using a qualitative content analysis. The results show that there are many success factors and that companies proceed differently in many areas when implementing social media marketing measures. Important success factors are a tailor-made, company-specific social media strategy with a clear formulation of goals, integration of social media marketing into the corporate strategy, openness to new social media trends, credibility and reputation, compliance with data protection, the correct handling of criticism, use of social media as a market research tool and a long-term social media strategy. However, the significance of the results should not be overestimated, since this is a qualitative study with a limited range and only examines individual cases. Further research on the success factors could be based on quantitative studies or group discussions in which experts or users or customers are interviewed. Another possibility is the qualitative examination of the user-generated content.
Künstliche Intelligenz (KI) hat sich in den letzten Jahren in der Gesellschaft stark ver-breitet und auch in Unternehmen einen zunehmenden Einsatz gefunden. Bekannt für den Einsatz sind meistens große internationale Konzerne, welche eine führende Position in den Märkten einnehmen. Um Deutschland als KI-Standort zu stärken, hat deshalb die Bundesregierung 2018 beschlossen, mit 5 Milliarden Euro deutsche Unternehmen in der Verwendung von KI zu fördern. Stand September 2021 wurden von diesen allerdings nur 346 Millionen abgerufen, wodurch sich die Frage stellt, wie besonders kleine und mittlere Unternehmen (KMUs) in Deutschland mit dem Thema KI umgehen.
Ziel dieser Arbeit ist es deshalb, die Perspektive der KMUs auf Akzeptanzkriterien, Hindernisse und Potenziale des Einsatzes von KI zu untersuchen. Um die Forschungs-fragen zu beantworten, wurde eine qualitative Interviewstudie mit fünf KMUs durchge-führt, welche im Anschluss mit dem Ansatz der qualitativen Inhaltsanalyse nach May-ring ausgewertet wurde.
Die Arbeit zeigt, dass Unternehmen ein großes Interesse am Thema KI haben und sich der Einsatz immer weiter verbreitet. KMUs sehen viel Potenzial durch den Einsatz der neuen Technologie, sehen aber noch einige Hindernisse, die es zu überwinden gilt.
Die Arbeit stellt eine Systematisierung der wissenschaftsphilosophischen Gedanken der klassischen Pragmatisten (Charles S. Peirce, William James, John Dewey) dar.
Deren Erfahrungstheorie sowie die Bestimmung des Verhältnisses von Theorie und Praxis bilden die Grundlage einer holistischen Wissenschaftsphilosophie.
Die exemplarische Anwendung auf klassische wissenschaftstheoretische Fragestellungen zeigt die Aktualität des Ansatzes.
Generation Z strömt derzeit mit neuen Wertvorstellungen und hohen Ansprüchen in die Arbeitswelt ein, was Führungskräfte vor eine große Herausforderung stellt. Um sich im Fachkräftemangel zu behaupten, die jungen Talente zu rekrutieren sowie langfristig an das Unternehmen zu binden, müssen Unternehmen, insbesondere Führungskräfte die Erwartungen und Anforderungen der Generation Z kennen und diesen gerecht werden. Während die Erwartungen und Anforderungen der Vorgängergenerationen bereits analysiert wurden, sind die der jungen Generation Z unbekannt.
Um die Erwartungen und Anforderungen der Generation Z an Führungskräfte und deren Verhaltensweisen zu identifizieren, wurde eine qualitative Forschungsmethode angewandt, indem fünf Experteninterviews mit Studierenden aus der Generation Z geführt wurden. Diese wurden anschließend mithilfe einer qualitativen Inhaltsanalyse anhand von Kategorien ausgewertet.
Die junge Generation stellt hohe Erwartungen an Führungskräfte sowie deren Verhalten ihnen gegenüber. So fordern sie nicht nur klare Vorgaben hinsichtlich der an sie gestellten Erwartungen, sondern zeigen auch das Bedürfnis nach regelmäßigem Austausch und Feedbackgesprächen mit ihrem Leader. Führung sollte für Generation Z immer auf Augenhöhe stattfinden, geprägt von einer offenen Kommunikation sowie einem wertschätzenden Umgang. Zudem sollte die Führungskraft als Ansprechpartner bei Problemen und Fragen für die Generation Z zur Seite stehen.
Die dargestellten Ergebnisse der Arbeit leisten einen wichtigen Beitrag für Wissenschaftler im Forschungsfeld Generationsmanagement und helfen zudem Entscheidungsträgern im Personalmanagement die Anforderungen und Erwartungen der jungen Generation Z zu erfüllen. Somit profitieren sie nicht nur im Recruiting davon, sondern können die jungen Talente möglicherweise langfristig an das Unternehmen binden.
Die Ukraine sieht seit dem Euromaidan im Jahr 2014 ihre Zukunft in einer stabilen Veran-kerung im westlichen Wertesystem. Für die EU ist die Ukraine ein priority partner und damit von besonderem Gewicht. Deshalb lag es folgerichtig im Interesse der EU, die Ukra-ine nach Kräften auf diesem Weg zu unterstützen.
Die wissenschaftliche Forschung zur EU-Demokratieförderung konzentrierte sich bis-her im Wesentlichen auf Staaten mit konkreter EU-Beitrittsperspektive. Sie kam zu dem Ergebnis, dass der Erfolg der Demokratieförderung maßgeblich von der Konditionierung eines EU-Beitritts getragen war. Damit konnte dieser Erfolg der EU als dominanter Träger der Demokratieförderung zugeordnet werden.
Mit dem Fokus auf Staaten ohne EU-Beitrittsperspektive entfällt diese Konditionie-rung. Auch weitere Akteure traten bei der Demokratieförderung hinzu, und die Wirksam-keit der Demokratieförderung kann nicht mehr der EU direkt zugeordnet werden. Es ent-stand also eine Forschungslücke, in welcher Weise jetzt die Wirksamkeit der EU-Demokratieförderung analysiert werden kann. Die vorliegende Studie greift diese For-schungslücke auf.
Zunächst wird analysiert, welcher Demokratiestatus der Ukraine und welche Defizite sich für den Untersuchungszeitraum ermitteln lassen. Im Anschluss erfolgt die Analyse der EU-Demokratieförderung auf der Grundlage einer eigens dafür entworfenen Definition von kohärenter Strategie, die eine statische und eine dynamische Dimension abbildet.
Die statische Dimension geht der Frage nach, ob die Zielsetzungen und Vorhaben der EU-Demokratieförderung auf die Demokratiedefizite zugeschnitten waren. Die dynami-sche Dimension des Transformationsprozesses beschäftigt sich mit der Frage, ob das jewei-lige Vorgehen den Prinzipien aus sozialkonstruktivistischer Perspektive folgte. Mit dieser sozialkonstruktivistischen Perspektive wird ein Weg aufgezeigt, wie man ohne eine EU-Beitritts-Konditionierung die Transformation demokratischer Werte und Normen erfolg-reich ausgestalten kann.
Das Ergebnis ist, dass die EU-Strategie der Demokratieförderung zwar mit ihren Ziel-setzungen und Vorhaben auf die Demokratiedefizite der Ukraine ausgerichtet war, aber auch, dass das Vorgehen in einem Fall nicht den Prinzipien aus sozialkonstruktivistischer Perspektive entsprach. Diesem Vorgehen lag keine kohärente EU-Strategie zugrunde.
Die Analyse auf der Ebene der Strategie lässt der EU-Demokratieförderung keine di-rekte Wirkung zuweisen, da auch andere Akteure eine Wirkung entfalten. Auf der Ebene eines konkreten Reformprojekts konnte dann der Nachweis geführt werden, dass die De-zen-tralisierungsreform direkt der EU zugeordnet werden kann, das Vorgehen den Prinzi-pien aus sozialkonstruktivistischer Perspektive folgt und eine positive Wirkung entfaltet.
Begünstigt wurde dieser Erfolg, da er sich auf demokratische Werte und Normen ab-stützen konnte, die in überdurchschnittlicher Ausprägung bereits vorhanden waren. Dar-über hinaus wurde aufgezeigt, dass dieses Projekt eine breit gefächerte potenzielle Wirkung auf den Reformprozess in Richtung Demokratie entfaltet.
Die Dissertation wurde am 14. Dezember 2021 abgeschlossen und an der Universität Koblenz-Landau eingereicht. Im Nachgang bietet ein „Postskript“ mit Datum September 2022 unter Berücksichtigung aktueller Entwicklungen eine Perspektive für weiterführende Forschungsfragen.
Eine Ursache des Insektenrückgangs ist die Abnahme der für Arthropoden wichtigen Lebensräume. Der kleinstrukturierte Obstanbau als Dauerkultur mit vielfältigen Strukturen (Bäume, Grünland, offener Boden) kann als Refugium wirken. Gerade Dauerkulturen, welche über viele Jahre bestehen bleiben, können einen großen ökologischen Wert für Insekten und Spinnentiere darstellen, wenn die negativen Einflüsse der Bewirtschaftung durch gezielte Maßnahmen minimiert werden. Im Gegensatz zu den gut untersuchten Streuobstwiesen liegen bisher nur wenige oder ungenaue Daten über die Arthropodenfauna in Erwerbsobstanlagen vor. Ziele dieser Arbeit sind eine genauere Erfassung der Arthropodenfauna in Erwerbsobstanlagen, Benennung der Einflussfaktoren und Erarbeitung einer indikatorgestützten Bewertungsmethode mit Entwicklung von Maßnahmen zur Förderung der Biodiversität. Es wurde eine intensive Erfassung der Insekten und Spinnentiere auf Basis von Individuenzahlen, Verteilung der Tiere auf Großgruppen, Artenzahlen der Käfer (inkl. Rote Liste) und Wanzen, deren Diversität und der sie beeinflussenden Faktoren auf vier Erwerbsobstflächen und einer Streuobstwiese als Referenzfläche in der Gemeinde Zornheim (Rheinland-Pfalz) untersucht. Mittels des erarbeiteten Bewertungsbogens wurden die Auswirkungen der fünf Faktorenkomplexe: Sonderstrukturen, Anlagenstruktur, Beschattung, Mahdregime und Einsatz von Pflanzenschutzmitteln auf die Arthropodenfauna erhoben und die auf der Fläche zu erwartende Biodiversität ermittelt. Die visuelle Darstellung der Einflussfaktoren mit Netzdiagrammen zeigt biodiversitätsbeeinträchtigende Faktoren und ermöglicht so Empfehlungen zur Aufwertung der Biodiversität. Die Bewertungsmethode kann nach Verifizierung im Rahmen von erfolgsorientierten Agrarumwelt- und Klimamaßnahmen (AUKM), zur Anerkennung von Kompensationsmaßnahmen (z.B. PIK) und zur Ermittlung des ökologischen Wertes (Ökosystemdienstleistung) von Obstanlagen genutzt werden. In modifizierter Form könnte es ebenfalls im Bereich der Flächenbewertung in Landschafts- und Bauleitplanung eingesetzt werden.
The application of artificial intelligences on digital games became more and more successful in recent years. A drawback is, that they need lots of computing power to achieve good results, the more complex the game, the more computing power is needed. In this thesis a strategy learning-system is implemented, which is based on crowd-learned heuristics. The heuristics are given in a wiki. The research is done according to the Design Science Research Methodology. The implemented system is allied to the game Dominion. To do this, an ontology for Dominion is designed. A mapping language is defined and implemented in the system, which allows the mapping of information in the wiki to an ontology. Furthermore, metrics to rate the found strategies are defined. Using the system, users can enter a mapping for the information transfer and apply it. They can also select cards from Dominion, for which the system determines and rates strategies. Finally, the system is evaluated by Dominion-players by rating the strategies, which are found by the system, and the defined metrics.
Formen des Zugangs in der Jugendhilfe – zur Gestaltung von Zugängen zum System der Hilfen zur Erziehung Kindern, Jugendlichen und Erwachsenen in unterschiedlichen familiären Beziehungen und Lebenslagen stehen in Deutschland bei Bedarf und auf Wunsch öffentliche Hilfeleistungen rund um das Thema Erziehung zur Verfügung. Repräsentiert wird dieses Angebot als Rechtsanspruch öffentlicher Hilfe in der Regel durch die örtlichen Jugendämter. In Folge der Einführung des Sozialgesetzbuches VIII (Kinder- und Jugendhilfegesetz, jetzt: Kinder- und Jugendstärkungsgesetzt/KJSG) befassten sich wiederholt wissenschaftliche Erhebungen mit dem Nutzen und den Wirkungen der in den Hilfen zur Erziehung vorhandenen Angebote aus Sicht der Adressatinnen und Adressaten, also den Kindern, Jugendlichen und Eltern. Dem Rechtsanspruch mit dem Angebot auf die Hilfen zur Erziehung auf der einen Seite, stehen die Adressatinnen und Adressaten dieser Hilfen auf der anderen zunächst gegenüber. Im Fokus der damit einhergehenden Adressaten- und Adressatinnenforschung steht die Frage, wie Adressatinnen und Adressaten den Zugang zu diesen Hilfen in ihrem Alltagsleben erhalten und ggf. integrieren. Ziel dieser Arbeit ist es daher zu untersuchen, wie sich aus Sicht von Eltern mit Jugendhilfeerfahrung dieser Zugang gestaltet, wie sie ihre diesbezüglichen Erfahrungen einordnen und bewerten. Um sich die Lebenswelten und Sinnhorizonte der Eltern zu erschließen, erfolgte die Datenerhebung durch transkribierte narrative Interviews. Diese wurden mittels qualitativ inhaltsanalytischer Verfahren strukturiert und sequenziert untersucht, um relevante Kodes, Konzepte und Kategorien aus den Erzählungen herauszuarbeiten. Dabei stellte sich heraus, dass es den einen Zugang nicht gibt, im Weiteren auch kein einfaches Setting zwischen Angebot und Nachfrage vorliegt. Vielmehr zeigen sich unterschiedliche Zugangsformen und individuelle Faktoren, die einen Zugang begünstigen oder behindern können. Zentral sind hier vor allem die Wirkung Anderer in der Biografie der Eltern, gleich ob aus Familie oder auf Seiten der Fachkräfte sowie deren Haltungen und das Vorhandensein von Ressourcen wie z.B. Wissen. Für die Praxis der Sozialen Arbeit bedeutet dies, sich den zunächst fremden Lebenswelten
der Adressatinnen und Adressaten verstehend zu nähern und nicht außer Acht zu lassen, dass diese ihnen mit ihren Bildern, Ideen, Wünschen und Lebenserfahrungen gegenüber treten, welche wahrgenommen und verstanden werden wollen.
Ralf Schauf
Men are currently underrepresented in traditionally female care-oriented (communal) engagement such as taking parental leave, whereas they are overrepresented in traditionally male (agentic) engagement such as breadwinning or leadership. We examined to what extent different prototypical representations of men affect men’s self-reported parental leave-taking intentions and more generally the future they can imagine for themselves with regard to work and care roles (i.e., their possible selves). We expected prototypes of men that combine the two basic stereotype dimensions of agency and communion to increase men’s communal intentions. In two experiments (N1 = 132, N2 = 233), we presented male participants with contrived newspaper articles that described the ideal man of today with varying degrees of agency and communion (between-subjects design with four conditions; combined agentic and communal vs. agentic vs. communal vs. control condition). Results of Experiment 1 were in line with the main hypothesis that especially presenting a combination of agency and communion increases men’s expectations for communal engagement: As compared to a control condition, men expected more to engage in caretaking in the future, reported higher parental leave-taking intentions, and tended to expect taking longer parental leave. Experiment 2 only partially replicated these findings, namely for parental leave-taking intentions. Both experiments additionally provided initial evidence for a contrast effect in that an exclusive focus on agency also increased men’s self-reported parental leave-taking intentions compared to the control condition. Yet, exclusively emphasizing communion in prototypes of men did not affect men’s communal intentions, which were high to begin with. We further did not find evidence for preregistered mechanisms. We discuss conditions and explanations for the emergence of these mixed effects as well as implications for the communication of gendered norms and barriers to men’s communal engagement more broadly.
Social media provides a powerful way for people to share opinions and sentiments about a specific topic, allowing others to benefit from these thoughts and feelings. This procedure generates a huge amount of unstructured data, such as texts, images, and references that are constantly increasing through daily comments to related discussions. However, the vast amount of unstructured data presents risks to the information-extraction process, and so decision making becomes highly challenging. This is because data overload may cause the loss of useful data due to its inappropriate presentation and its accumulation. To this extent, this thesis contributed to the field of analyzing and detecting feelings in images and texts. And that by extracting the feelings and opinions hidden in a huge collection of image data and texts on social networks After that, these feelings are classified into positive, negative, or neutral, according to the features of the classified data. The process of extracting these feelings greatly helps in decision-making processes on various topics as will be explained in the first chapter of the thesis. A system has been built that can classify the feelings inherent in the images and texts on social media sites, such as people’s opinions about products and companies, personal posts, and general messages. This thesis begins by introducing a new method of reducing the dimension of text data based on data-mining approaches and then examines the sentiment based on neural and deep neural network classification algorithms. Subsequently, in contrast to sentiment analysis research in text datasets, we examine sentiment expression and polarity classification within and across image datasets by building deep neural networks based on the attention mechanism.
Scientific experimentation in the special needs schools for pupils with intellectual disabilities
(2022)
Naturwissenschaftliches Experimentieren im Förderschwerpunkt geistige Entwicklung: An Schulen mit dem Förderschwerpunkt geistige Entwicklung führen Schülerinnen und Schüler nur selten naturwissenschaftliche Experimente durch. Doch auch diese Schülerschaft kann mit adressatengerechten Lernmaterialien Experimente durchführen, deren Gestaltungskriterien in dieser Studie ermittelt werden. Zudem wird in der Studie erfasst, wie sich die Schülerinnen und Schüler über ein Schuljahr in ihrer experimentellen Kompetenz weiterentwickeln.
Background. Agricultural plastic mulches offer great benefits such as higher yields and lower pesticide use. Yet, plastic mulches may disintegrate over time and fragment into smaller debris. Such plastic debris is expected to remain in the field after removal of the plastic mulch and thus contributes to soil contamination with plastics.
Method. To investigate this, we collected soil samples at 0–10 cm and 10–40 cm depth from three fields covered with black mulch film for three consecutive years. Three fields without any reported plastic use served as control. Visual plastic debris > 1 cm (macroplastics) was collected from the soil surface. Mesoplastics between 2 mm and 1 cm were density separated from the sampled soil using saturated NaCl solution and analyzed by Fourier-transform infrared spectroscopy. Debris ≤ 2 mm (microplastics) was dispersed from 50 g soil using sodium hexametaphosphate solution followed by the aforementioned density separation. The separated polyethylene (PE), polypropylene (PP), and polystyrene (PS) were quantified via solvent-based pyrolysis–gas chromatography/mass spectrometry (Py–GC/MS).
Results. With 89–206 fragments ha−1, the majority of macroplastics were located in fields previously covered with mulch films. 80% of the collected specimen were identified as black PE film. The number of mesoplastics in plastic-mulched soil was 2.3 particles kg−1, while only 1.0 particles kg−1 were found in the reference fields. Py–GC/MS revealed microplastic levels of up to 13 mg kg−1. The PE content was significantly higher in plastic-mulched fields than in reference fields.
Discussion. Although the identified plastic levels are lower than those reported in comparable studies, our results still suggest that plastic mulching functions as a source of plastic debris in agricultural systems. Due to its severely restricted degradability, these plastics are likely to accumulate in soil in the long term and further fragment into smaller and smaller debris.
Manmade dams have been constructed from centuries for multiple purposes, and in the past decades they have been constructed in a fast pace, with the hotspot in tropical and subtropical regions. However, studies that explore hydrodynamics in these areas are scarce and biased to the rich literature available for temperate regions. Lakes and reservoirs have the same controlling mechanisms for physical processes and primary production, hence, analyses that were initially conceptualized for lakes are frequently applied for reservoirs. Nevertheless, longitudinal gradients in reservoirs challenges the application of these approaches.
Degradation of water quality in reservoirs is a major concern, and it is expected to be aggravated with climate change. Therefore, studies that explore mechanisms controlling water quality are essential for the maintenance of these systems, especially in tropical and subtropical regions. The aim of this thesis is to comprehend the role of hydrodynamic processes in the fate of nutrients in reservoirs and its implications on water quality, in a subtropical region. With focus on the relevance of different density current patterns. For that, analyses combining field measurements and numerical simulations were performed in a medium to small size subtropical drinking water reservoir for a complete seasonal cycle. Measurements were conducted combining several approaches: traditional sampling, sensors in high temporal and spatial resolution, and remote sensing. Besides, hydrodynamic models were set up and calibrated to reproduce observations, and to simulate scenarios that assisted on the analysis.
Results showed that different flow paths of density currents did not influence on phytoplankton dynamics. At the regions where the main nutrient supply was the river inflow (upstream), the density currents did not vary, the euphotic zone usually covered the entire depth, and vertical mixing was observed on a daily basis, turning the flow path of the density currents irrelevant. At downstream regions, the remobilization of nutrients in the sediment was the main source for primary production. Even though density currents had a seasonal pattern in the downstream region, thermal stratification conditions were the driver for variations in chlorophyll-a concentrations, with peaks after vertical mixing. This mechanism had in its favor the frequent anoxic conditions in the hypolimnion that enhanced the dissolution of reactive phosphorus from the sediment. Anoxic conditions were easily reached because the sediment in the downstream area was rich in organic matter. Phytoplankton produced in the upstream area was transported by the density currents, and for this reason, large concentrations of chl-a was observed below the euphotic zone. Further, the extensive measurements of temperature, and flow velocities, together with the hydrodynamic models, provided insights about the hydrodynamics of reservoirs. For instance, that the relevant processes occurred along the longitudinal, and mixing conditions varied along it. The relevance of inflow conditions regarding the presence of structures such as forebays and pre-dams, and the degree of stream shading in the catchment was assessed. And turbulence and internal waves had different features than the documented for high latitudes. Those findings can assist on the management of reservoirs, based on the comprehension of the physical processes.
Background: For over a century, scientists have studied host-pathogen interactions between the crayfish plague disease agent Aphanomyces astaci and freshwater crayfish. It has been hypothesised that North American crayfish hosts are disease-resistant due to the long-lasting coevolution with the pathogen. Similarly, the increasing number of latent infections reported in the historically sensitive European crayfish hosts seems to indicate that similar coevolutionary processes are occurring between European crayfish and A. astaci. Our current understanding of these host-pathogen interactions is largely focused on the innate immunity processes in the crayfish haemolymph and cuticle, but the molecular basis of the observed disease-resistance and susceptibility remain unclear. To understand how coevolution is shaping the host’s molecular response to the pathogen, susceptible native European noble crayfish and invasive disease-resistant marbled crayfish were challenged with two A. astaci strains of different origin: a haplogroup A strain (introduced to Europe at least 50 years ago, low virulence) and a haplogroup B strain (signal crayfish in lake Tahoe, USA, high virulence). Here, we compare the gene expression profiles of the hepatopancreas, an integrated organ of crayfish immunity and metabolism.
Results: We characterised several novel innate immune-related gene groups in both crayfish spe cies. Across allchallenge groups, we detected 412 differentially expressed genes (DEGs) in the noble crayfish, and 257 DEGs in the marbled crayfish. In the noble crayfish, a clear immune response was detected to the haplogroup B strain, but not to the haplogroup A strain. In contrast, in the marbled crayfish we detected an immune response to the haplogroup A strain, but not to the haplogroup B strain. Conclusions: We highlight the hepatopancreas as an important hub for the synthesis of immune molecules in the response to A. astaci. A clear distinction between the innate immune response in the marbled crayfish and the noble crayfish is the capability of the marbled crayfish to mobilise a higher variety of innate immune response effectors.
The use of agricultural plastic covers has become common practice for its agronomic benefits such as improving yields and crop quality, managing harvest times better, and increasing pesticide and water use efficiency. However, plastic covers are suspected of partially breaking down into smaller debris and thereby contributing to soil pollution with microplastics. A better understanding of the sources and fate of plastic debris in terrestrial systems has so far been hindered by the lack of adequate analytical techniques for the mass-based and polymer-selective quantification of plastic debris in soil. The aim of this dissertation was thus to assess, develop, and validate thermoanalytical methods for the mass-based quantification of relevant polymers in and around agricultural fields previously covered with fleeces, perforated foils, and plastic mulches. Thermogravimetry/mass spectrometry (TGA/MS) enabled direct plastic analyses of 50 mg of soil without any sample preparation. With polyethylene terephthalate (PET) as a preliminary model, the method limit of detection (LOD) was 0.7 g kg−1. But the missing chromatographic separation complicated the quantification of polymer mixtures. Therefore, a pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) method was developed that additionally exploited the selective solubility of polymers in specific solvents prior to analysis. By dissolving polyethylene (PE), polypropylene (PP), and polystyrene (PS) in a mixture of 1,2,4-trichlorobenzene and p-xylene after density separation, up to 50 g soil became amenable to routine plastic analysis. Method LODs were 0.7–3.3 mg kg−1, and the recovery of 20 mg kg−1 PE, PP, and PS from a reference loamy sand was 86–105%. In the reference silty clay, however, poor PS recoveries, potentially induced by the additional separation step, suggested a qualitative evaluation of PS. Yet, the new solvent-based Py-GC/MS method enabled a first exploratory screening of plastic-covered soil. It revealed PE, PP, and PS contents above LOD in six of eight fields (6% of all samples). In three fields, PE levels of 3–35 mg kg−1 were associated with the use of 40 μm thin perforated foils. By contrast, 50 μm PE films were not shown to induce plastic levels above LOD. PP and PS contents of 5–19 mg kg−1 were restricted to single observations in four fields and potentially originated from littering. The results suggest that the short-term use of thicker and more durable plastic covers should be preferred to limit plastic emissions and accumulation in soil. By providing mass-based information on the distribution of the three most common plastics in agricultural soil, this work may facilitate comparisons with modeling and effect data and thus contribute to a better risk assessment and regulation of plastics. However, the fate of plastic debris in the terrestrial environment remains incompletely understood and needs to be scrutinized in future, more systematic research. This should include the study of aging processes, the interaction of plastics with other organic and inorganic compounds, and the environmental impact of biodegradable plastics and nanoplastics.